Issue 1652

Resolves issue: http://code.google.com/p/otwarchive/issues/detail?id=1652

Referenced issue said: "Don't show restricted related works to logged out users". I went ahead and made it so no restricted works show up for guests on either side of the "related" relationship. This goes both for "Inspired" and "Translations". If the work is restricted, guests will see [Restricted Work] and 'Log in to view.'.